Can we still say we are gambling if the event is something we are at least 90% sure that we are going to win?
Of course, you're staking money on it, and you are not guaranteed to win. And so, what makes you think that something like 90% of the potential chance of winning wouldn't be considered gambling?
As long as you're taking chances, you're putting money with or without a chance, you're gambling and that's the reason that we're all gamblers.
We're taking chances and even if we know that we're going to lose money, we still bet.